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        <h2 id="Redux深入"><a href="#Redux深入" class="headerlink" title="Redux深入"></a>Redux深入</h2><h3 id="1-redux文件拆分"><a href="#1-redux文件拆分" class="headerlink" title="1.redux文件拆分"></a>1.redux文件拆分</h3><p>我们将计数器的案例进行文件拆分,使代码更加容易维护和阅读,我们来增加一个store文件夹</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">store</span><br><span class="line">    │  action-types.js</span><br><span class="line">    │  index.js</span><br><span class="line">    │</span><br><span class="line">    ├─actions</span><br><span class="line">    │      counter.js</span><br><span class="line">    │</span><br><span class="line">    └─reducer</span><br><span class="line">            counter.js</span><br></pre></td></tr></table></figure>

<ul>
<li><p>action-types用来存放需要的常量</p>
  <figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">export const ADD &#x3D; &#39;ADD&#39;;</span><br><span class="line">export const MINUS &#x3D; &#39;MINUS&#39;;</span><br></pre></td></tr></table></figure>
</li>
<li><p>counter中存放reducer的逻辑</p>
  <figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">import * as Types from &#39;..&#x2F;action-types&#39;</span><br><span class="line">export default function reducer(state&#x3D;&#123;number:0&#125;,action) &#123;</span><br><span class="line">  switch (action.type)&#123;</span><br><span class="line">    case Types.ADD:</span><br><span class="line">      return &#123;number:state.number + action.amount&#125;;</span><br><span class="line">    case Types.MINUS:</span><br><span class="line">      return &#123;number:state.number - action.amount&#125;;</span><br><span class="line">  &#125;</span><br><span class="line">  return state;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<a id="more"></a></li>
<li><p>store中的index文件用来创建store</p>
  <figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> &#123;createStore&#125; <span class="keyword">from</span> <span class="string">&#x27;../redux&#x27;</span>;</span><br><span class="line"><span class="keyword">import</span> reducer <span class="keyword">from</span> <span class="string">&#x27;./reducer/counter&#x27;</span>;</span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> createStore(reducer);</span><br></pre></td></tr></table></figure>
</li>
<li><p>组件中的内容可更改为</p>
  <figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> React,&#123;Component&#125; <span class="keyword">from</span> <span class="string">&#x27;react&#x27;</span></span><br><span class="line"><span class="keyword">import</span> ReactDOM,&#123;render&#125; <span class="keyword">from</span> <span class="string">&#x27;react-dom&#x27;</span>;</span><br><span class="line"><span class="keyword">import</span> store <span class="keyword">from</span> <span class="string">&#x27;./store&#x27;</span>;</span><br><span class="line"><span class="keyword">import</span> * <span class="keyword">as</span> Types <span class="keyword">from</span> <span class="string">&#x27;./store/action-types&#x27;</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Counter</span> <span class="keyword">extends</span> <span class="title">React</span>.<span class="title">Component</span> </span>&#123;</span><br><span class="line">  <span class="function"><span class="title">constructor</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">    <span class="built_in">super</span>();</span><br><span class="line">    <span class="built_in">this</span>.state = &#123;<span class="attr">number</span>:store.getState().number&#125;</span><br><span class="line">  &#125;</span><br><span class="line">  <span class="function"><span class="title">componentDidMount</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">    store.subscribe( <span class="function">() =&gt;</span> &#123;</span><br><span class="line">      <span class="built_in">this</span>.setState(&#123;<span class="attr">number</span>:store.getState().number&#125;)</span><br><span class="line">    &#125;)</span><br><span class="line">  &#125;</span><br><span class="line">  handleAddClick=<span class="function">()=&gt;</span>&#123;</span><br><span class="line">    store.dispatch(&#123;<span class="attr">type</span>:Types.ADD,<span class="attr">amount</span>:<span class="number">1</span>&#125;);</span><br><span class="line">  &#125;;</span><br><span class="line">  handleMinusClick=<span class="function">()=&gt;</span>&#123;</span><br><span class="line">    store.dispatch(&#123;<span class="attr">type</span>:Types.MINUS,<span class="attr">amount</span>:<span class="number">1</span>&#125;);</span><br><span class="line">  &#125;;</span><br><span class="line">  <span class="function"><span class="title">render</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">    <span class="keyword">return</span> &lt;div&gt;</span><br><span class="line">      &lt;p&gt;&#123;<span class="built_in">this</span>.state.number&#125;&lt;/p&gt;</span><br><span class="line">      &lt;button onClick=&#123;<span class="built_in">this</span>.handleAddClick&#125;&gt;+&lt;/button&gt;</span><br><span class="line">      &lt;button onClick=&#123;<span class="built_in">this</span>.handleMinusClick&#125;&gt;-&lt;/button&gt;</span><br><span class="line">    &lt;/div&gt;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">ReactDOM.render(<span class="xml"><span class="tag">&lt;<span class="name">Counter</span>/&gt;</span></span>,<span class="built_in">window</span>.root);</span><br></pre></td></tr></table></figure>

</li>
</ul>
<blockquote>
<p>此时我们发现在redux和组件中都应用了action-types所以我们希望继续进行拆分,在store下创建action文件夹,用来生成action对象,我们管action文件中的方法称之为actionCreator</p>
</blockquote>
<ul>
<li><p>action文件夹中的counter,用来生成对应组件的action对象</p>
  <figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> * <span class="keyword">as</span> Types <span class="keyword">from</span> <span class="string">&#x27;../action-types&#x27;</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> &#123;</span><br><span class="line">  <span class="function"><span class="title">add</span>(<span class="params">amount</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">return</span> &#123;<span class="attr">type</span>:Types.ADD,amount&#125;</span><br><span class="line">  &#125;,</span><br><span class="line">  <span class="function"><span class="title">minus</span>(<span class="params">amount</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">return</span> &#123;<span class="attr">type</span>:Types.MINUS,amount&#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p>再次更改组件代码</p>
  <figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> React,&#123;Component&#125; <span class="keyword">from</span> <span class="string">&#x27;react&#x27;</span></span><br><span class="line"><span class="keyword">import</span> ReactDOM,&#123;render&#125; <span class="keyword">from</span> <span class="string">&#x27;react-dom&#x27;</span>;</span><br><span class="line"><span class="keyword">import</span> store <span class="keyword">from</span> <span class="string">&#x27;./store&#x27;</span>;</span><br><span class="line"><span class="keyword">import</span> actions <span class="keyword">from</span> <span class="string">&#x27;./store/actions/counter&#x27;</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Counter</span> <span class="keyword">extends</span> <span class="title">React</span>.<span class="title">Component</span> </span>&#123;</span><br><span class="line">  <span class="function"><span class="title">constructor</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">    <span class="built_in">super</span>();</span><br><span class="line">    <span class="built_in">this</span>.state = &#123;<span class="attr">number</span>:store.getState().number&#125;</span><br><span class="line">  &#125;</span><br><span class="line">  <span class="function"><span class="title">componentDidMount</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">    store.subscribe( <span class="function">() =&gt;</span> &#123;</span><br><span class="line">      <span class="built_in">this</span>.setState(&#123;<span class="attr">number</span>:store.getState().number&#125;)</span><br><span class="line">    &#125;)</span><br><span class="line">  &#125;</span><br><span class="line">  handleAddClick=<span class="function">()=&gt;</span>&#123;</span><br><span class="line">    store.dispatch(actions.add(<span class="number">1</span>));</span><br><span class="line">  &#125;;</span><br><span class="line">  handleMinusClick=<span class="function">()=&gt;</span>&#123;</span><br><span class="line">    store.dispatch(actions.minus(<span class="number">1</span>));</span><br><span class="line">  &#125;;</span><br><span class="line">  <span class="function"><span class="title">render</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">    <span class="keyword">return</span> &lt;div&gt;</span><br><span class="line">      &lt;p&gt;&#123;<span class="built_in">this</span>.state.number&#125;&lt;/p&gt;</span><br><span class="line">      &lt;button onClick=&#123;<span class="built_in">this</span>.handleAddClick&#125;&gt;+&lt;/button&gt;</span><br><span class="line">      &lt;button onClick=&#123;<span class="built_in">this</span>.handleMinusClick&#125;&gt;-&lt;/button&gt;</span><br><span class="line">    &lt;/div&gt;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br><span class="line">ReactDOM.render(<span class="xml"><span class="tag">&lt;<span class="name">Counter</span>/&gt;</span></span>,<span class="built_in">window</span>.root);</span><br></pre></td></tr></table></figure>

</li>
</ul>
<blockquote>
<p>我们已经将redux的流程进行了详细的拆分,让我们来总结一下redux的流程吧：</p>
</blockquote>
<p><img src="http://son.fullstackjavascript.cn/redux.png"></p>
<h3 id="2-实现多个counter"><a href="#2-实现多个counter" class="headerlink" title="2.实现多个counter"></a>2.实现多个counter</h3><p>在redux中只能拥有一个store所以我们需要将多个状态进行合并,状态是通过reducer返回的，所以我们可以将多个reducer进行合并达到合并状态的目的。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line">│  index.js</span><br><span class="line">│  redux.js</span><br><span class="line">│</span><br><span class="line">├─components</span><br><span class="line">│      counter1.js</span><br><span class="line">│      counter2.js</span><br><span class="line">│</span><br><span class="line">└─store</span><br><span class="line">    │  action-types.js</span><br><span class="line">    │  index.js</span><br><span class="line">    │</span><br><span class="line">    ├─actions</span><br><span class="line">    │      counter1.js</span><br><span class="line">    │      counter2.js</span><br><span class="line">    │</span><br><span class="line">    └─reducer</span><br><span class="line">            counter1.js</span><br><span class="line">            counter2.js</span><br><span class="line">            index.js</span><br></pre></td></tr></table></figure>

<blockquote>
<p>这里我们将counter1的逻辑进行拷贝，粘贴出counter2</p>
</blockquote>
<ul>
<li><p>action-types新增counter2处理的常量</p>
  <figure class="highlight diff"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">export const ADD = &#x27;ADD&#x27;;</span><br><span class="line">export const MINUS = &#x27;MINUS&#x27;;</span><br><span class="line"></span><br><span class="line"><span class="addition">+ export const INCREMENT = &#x27;INCREMENT&#x27;;</span></span><br><span class="line"><span class="addition">+ export const DECREMENT = &#x27;DECREMENT&#x27;;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>对应的counter2中的action也进行更改</p>
  <figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> * <span class="keyword">as</span> Types <span class="keyword">from</span> <span class="string">&#x27;../action-types&#x27;</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> &#123;</span><br><span class="line">  <span class="function"><span class="title">add</span>(<span class="params">amount</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">return</span> &#123;<span class="attr">type</span>:Types.INCREMENT,amount&#125;</span><br><span class="line">  &#125;,</span><br><span class="line">  <span class="function"><span class="title">minus</span>(<span class="params">amount</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">return</span> &#123;<span class="attr">type</span>:Types.DECREMENT,amount&#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p>同样reducer中处理也是一样的</p>
  <figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> * <span class="keyword">as</span> Types <span class="keyword">from</span> <span class="string">&#x27;../action-types&#x27;</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> <span class="function"><span class="keyword">function</span> <span class="title">reducer</span>(<span class="params">state=&#123;number:<span class="number">0</span>&#125;,action</span>) </span>&#123;</span><br><span class="line">  <span class="keyword">switch</span> (action.type)&#123;</span><br><span class="line">    <span class="keyword">case</span> Types.INCREMENT:</span><br><span class="line">      <span class="keyword">return</span> &#123;<span class="attr">number</span>:state.number + action.amount&#125;;</span><br><span class="line">    <span class="keyword">case</span> Types.DECREMENT:</span><br><span class="line">      <span class="keyword">return</span> &#123;<span class="attr">number</span>:state.number - action.amount&#125;;</span><br><span class="line">  &#125;</span><br><span class="line">  <span class="keyword">return</span> state;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<blockquote>
<p>现在问题出现了我们拥有了两个reducer,我们要将两个reducer进行合并,合并成一个新的reducer</p>
</blockquote>
</li>
<li><p>combineReducers</p>
  <figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> counter1 <span class="keyword">from</span> <span class="string">&#x27;./counter1&#x27;</span>;</span><br><span class="line"><span class="keyword">import</span> counter2 <span class="keyword">from</span> <span class="string">&#x27;./counter2&#x27;</span>;</span><br><span class="line"><span class="keyword">let</span> combineReducers = <span class="function">(<span class="params">reducers</span>) =&gt;</span> &#123;</span><br><span class="line">  <span class="keyword">return</span> <span class="function">(<span class="params">state=&#123;&#125;,action</span>)=&gt;</span>&#123;</span><br><span class="line">    <span class="keyword">let</span> obj = &#123;&#125;;</span><br><span class="line">    <span class="function"><span class="title">for</span>(<span class="params"><span class="keyword">let</span> key <span class="keyword">in</span> reducers</span>)</span>&#123;</span><br><span class="line">      obj[key] = reducers[key](state[key],action); <span class="comment">//调用原有的reducer将返回的结果放到对象上</span></span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> obj; <span class="comment">// 将合并后的对象进行返回即可 &#123;counter1:&#123;number:0&#125;,counter2:&#123;number:0&#125;&#125;</span></span><br><span class="line">  &#125;</span><br><span class="line">&#125;;</span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> combineReducers(&#123;</span><br><span class="line">  counter1,counter2</span><br><span class="line">&#125;);</span><br></pre></td></tr></table></figure>
</li>
<li><p>最后组件中获取状态要增加合并时的命名空间来获取</p>
  <figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="title">constructor</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">    <span class="built_in">super</span>();</span><br><span class="line">    <span class="built_in">this</span>.state = &#123;<span class="attr">number</span>:store.getState().counter1.number&#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="function"><span class="title">componentDidMount</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">    store.subscribe( <span class="function">() =&gt;</span> &#123;</span><br><span class="line">        <span class="built_in">this</span>.setState(&#123;<span class="attr">number</span>:store.getState().counter1.number&#125;)</span><br><span class="line">    &#125;)</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
</ul>
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